Phonograph-reproducer.



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PHONGRAPHREPEODUCER.

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Spcciiicaton of Letters Patent.

Patented lilovp 5., im n.

Application tiled August 21, 1917. Serial No. W739i.

Z'o all whom it may concern.

Beit known that l, Aronne E. PARNALL, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State oit' illinois, have invented certain new and useful improvements in Phonograph-Reproducers; and I do hereby declare that the following is a full, clear, and exact description of the saine, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which forni a part of this specification.

It has been the practice when mounting diaphragms in phonograph reproducers or sound boxes to irst place a diaphragm in a sound boX and then secure the inner end ot' a stylus arm to the diaphragm by means of cement or any other suitable material which is placed around the end of the stylus arm arm secured to one another. This process has not proven satisfactory for the reason that very often the inner end ot the stylus arni is not secured directly in the center ot the diaphragm but oil center which results in the production of disconcerting sound reproductions.

This invention relates to an improved forni of a phonograph reproducer wherein the inner end of the stylus arm is adapted to be securely fastened to the exact center of the diaphragm, by means of a resilient meinber secured between the diaphragm and the reproducer casing.

llt is an Object-of this invention to produce a phonograph reprodncer in which thediat phragm and the stylus arm are formed to insure exact centering` oi the inner end or" the stylus arm with respect to the diaphragm.

llt is also an object of the invention to construct a phonograph sound boit havinga grooved gasket member adapted to hold a centrally apertured diaphragm. exactly in the center of the sound box to permit the inner hooked end ot a stylus arm to be securely fastened directly in the center oi? said diaphragm.

It is furthermore an object of the inven-` tion to construct a phonograph reproducer wherein the diaphragm is held -eractlym the center ort the reproducer permit the inner end of a stylus arm to be secured exi actlyin the center of the diaphragm. it is an important object of the invention to produce a phonograph `reproducer of simple and effective construction wherein the stylus arm is insured of being attached to the center `of the diaphragm.

Other and further important objects of the invention will be apparent from the disclosures in the drawings and specification.l

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

@n the drawings: Figure l is a central vertical section taken through a phonograph reproducer embodying the principles of the invention, With parts shown in elevation.

FigQ is a bottom plan view thereof.

Fig'. 3 is an enlarged detail section taken on line 3-3 of Fig. 2, with parts broken away.

Fig. 4f is a central vertical section ot the reproducer diaphragm `and its supporting and centering means. y

Fig. 5 is an enlarged fragmentary vertical section taken through the central portion ot the diaphragm showing the inner end of the stylus arm partly engaged Ain Vthe central aperture oit said diaphragm. Y

Fig, 6 is aV similar section showing the next step in the operation.

Fig. i is a similar view showing the stylus arm secured to the center of the diaphragm.

As shown on the drawings:

The reiereiice'numeral l, designates a'- piionograph reprodueer casing or sound box, provided with an inner rectangular periphterior at one side of the sound box are two parallel arms 3, having pivotally mounted therebetween by means of pivot screws ha stylus comprising a stylus arm 5, and a re-A tially at right angles to the' main portion' of the arm as denoted by the-reference `eral recess 2. Rigidly formed on the eX- numeral 8. integrally formed on the end l 'and projecting to one sidecof the bent stylus portion 8, is a hook or projection'), having a lower straight edge 10, disposed at right angles to the outer edge lot the bent stylus lili) IIA mica or other snitahle mater from any t ineens@ angles to the inner edge of the bent stylus portion 8, and parallel to the edge l0, of'

the projection. 9.

- Removably 'disposed centrally within the sound box l, is a diaphragm 13, made of iol and having the outer perii'iheral margin tl'nreoi engaged in a continuous groove ifi, formed in the inner peripheral surface of a reetangularly cross-sectioned rubber ring,r or gasket l5, halfway between the top and bottom Snrtaces of said gasket. The gasket l5, is adapted to seat within the right angled recess 2, formed in the sound box, thus alf-- tordingafineans for holding me diaphragm 13,-p'ositioned exactly in the center of the sound box, and preventing the same from shitting laterally. To hold the gasket and diaphragm in. position Within the sound box, a split liet motel spring ring or retaining washer 1G, is sprnnointo the sonnd hoz; l, and` seats against' t e ioiver surface ot' the gasket l5.

The diaphragm 13, han an aperture or opening 17, formed exactly in -"the center thereof, to permit the hook r9, of the stylus :ii'ni 5, to he projected therethrough as shown in Fig. before the diaphragm 13.

and the gasket l5, nre mounted in the sound loon. The diaphragm and the pivoted stylus arm are then moved toward one another to the position. shown in 6, 'to permit the straight edge l0, o? the hook projection 9, to seat against the top or inner surface of seid diaiiihragi'n and the straight edge l2, of the stop projection li, to Contact the lower or outer surface of the diaphragm. The gaeitet and the diaphragm ere then positioned in 'the sound box to insure perfect centering of the diaphragm, and cement or any other suitable material i8, .is dropped or dis around the projection l1, and the lient etylne portion 8, iillin@A the diepl'iregm aperture 17, after which the diaphragm and the ggnsfltet are removed from the sound hon, to permit more of the cement 18,- to he placed around the hooked stylus projection 9, to nnite With the Cement already in "the :ipertnre l?, thueinsnring n good connection he-v tween the stylus ari-n and the" dinphrngin with the inn end of the Stylos ir-m l tioned dii center oi the f phragni o f t to transmit;V f.

are non' replaced in the eonnd hox and the Split spring ring lli, is4 sprung into position agninet the hottoin .ein-.nee ol' the gneltet to hold the same ysecured in position.

I am :tirare that numerous details ot oon- Struction may he varied through a wide range 'ithont deinirtingy from the principles vot this invention, sind l therefore do not pnrpose limiting the potent grunted otherwise than necessitated hy the primI art.

claim ne my invention:

l. The combination with :in aportni'eil phonograph diaphragm. ot a 'st ijlus erin, and projections: integrally termed on opposite edges and at different distances from the inner end of snid )plus nrm, one of sziiil projections adapted to project through the apertiired diaphragm to engage one Surface thereof while the other projection engnges the other diaphragm surface.

Q. The conihii'nition `with :i centrally zxperturcd phonograph diaphragm, of a Stylus arm having the inner cir1 bent at snhstnin tiollj,v right angles to the main portion of; said arm, a projection integrally formed :it the end nnd to one side ol .seid lient stylus portion having n Stra' ht edge adopted to liatly Contact one surface of the diaphragm when said projection is iii-riveted throng-gh the aperture in sei/l diaphragm, a second projection integrnllf forint, l on the opposite edge and at :i short distance from the end of said bent stylus portion having :i straight edge adopted to tintly Contact the other diaphragm surface, find ineens for eecnring said projections to the diaphragm insuring proper centering; of the flippin-aghi.

The combination with an npertured phonograph diaphragm, of a iat Stylus arm honi; at right :ingles it its inner end, and flat. projections disposed in the'snme plano and integrally forme-d on opposite edgee of the hent portion of the f ylns arm adopted to eng: ,ee opposite Stirn es of said diaphragm.

rthe combination with an npertured phonograph diaphragm, of a. ilat 'stylus arm, Adat projections disposed in the saine plane und integrally diposed on opposite edges and ot dililerent fr-rom the inner end of said stylus arm, said projections adapted to engage opposite surfaces of Said da iiihrsigm, and means for seeming said projections to said :linp A in. y

'in teetimony nheeor have hereunto subscribed my inno.;y in the presence of two Subscribing Within 

